Concentration dependent Dy3+ activated LiPbB5O9 phosphor: Structure and luminescence studies for white LED applications
Abstract
In this study, distinct concentrations of Dy3+ ions (0.04, 0.07, 0.1, 0.4 and 0.7 mol%) doped LiPbB5O9 phosphors were fabricated via solid state reaction technique. X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermo-gravimetric studies (TG-DSC) and photoluminescence characterizations were performed to LiPbB5O9:Dy3+ phosphors. Photoluminescence excitation and emission spectra were recorded at 576 nm and 349 nm, respectively. The stress, the critical distance (Rc) and energy transfer parameters (Q) between the Dy3+ ions were evaluated for all concentrations. To interpret the white light emission ability of the LiPbB5O9:Dy3+ phosphor, yellow to blue (Y/B) intensity ratios have been calculated. The decay curves of 4F9/2 level of Dy3+ions were studied. The CIE color co-ordinates and coordinate color temperatures (CCT) were also calculated. From these studies, it is mentioned that LiPbB5O9:0.4Dy3+ phosphor is a suitable material for fabrication of WLEDs and laser applications.
- Publication:
-
Optical Materials
- Pub Date:
- January 2020
- DOI:
- 10.1016/j.optmat.2019.109515
- Bibcode:
- 2020OptMa..9909515R
- Keywords:
-
- William-Hall analysis;
- Photoluminescence;
- Lifetime;
- White light;
- Energy transfer